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Machine Guarding
Image credit: OSHA
Session Objectives
You will be able to:
Understand the hazardous actions of different types of machinery
Identify the hazards of working with machinery
Identify machine safeguards and know how they work
Properly operate machines with guards
Why Machines Must Be Properly Guarded
Point of operation hazards
Power transmission apparatus hazards
800 deaths each year
High injury rates
Amputations, fractures, lacerations, and crushing
Electric shock and burns
Unsafe Machines Cause Injuries
Poorly designed machines
Poorly maintained machines
Machines being used for unintended purposes
Machine not properly installed
Inadequate safeguarding
Objects discharged from the machine
Unsafe Actions Cause Injuries
Reach around, under, over, or through guards into hazardous areas
Remove or bypass guards
Reach into equipment to remove stuck or jammed material
Not use electrical safety procedures
Not wear appropriate protective equipment
Not know how to properly service or repair machines
Regulatory Requirements
29 CFR 1910, Subpart O
Applies to specific types of equipment
Training
Where Machine Hazards Occur
Point of operation
Drill bit cutting wood
In-running nip points
Power transmission apparatus
Operating controls and moving parts
Types of Rotating Machine Parts
Collars, couplings, and cams
Clutches, gears, and pulleys
Flywheels
Shafts, including shaft ends
Image credit: OSHA
Nip Points
Hazard—hands, arms, or whole body get caught in nip
Causes lacerations, crushing, amputation, or death
Created by:
Two parts rotating in opposite directions
Parts rotating tangentially
Parts rotating close to a fixed part
Point of Operation Functions
Cutting
Punching
Shearing
Bending
Compressing
Cutting Machines and Actions
Hazard—Cutting action, flying chips, or scrap material cut fingers or strike the head or body
Machines
Band and circular saws
Boring or drilling
Lathes and milling
Actions
Rotating, reciprocating, or transverse motion
Punching Machines
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